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speakup: keyhelp: guard letter_offsets possible out-of-range indexing

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: speakup: keyhelp: guard letter_offsets possible out-of-range indexing help_init() builds letter_offsets[] by using the first byte of each function name as an index via `(start & 31) - 1`. If function_names are overridden from sysfs (root) with a name starting outside [a–z], the index underflows or exceeds the array, leading to OOB write. Function names can be overridden with the following commands as root: modprobe speakup_soft echo "0 _bad" > /sys/accessibility/speakup/i18n/function_names # then press Insert+2 on /dev/tty This fix checks the first letter in help_init(), and if it is not in the [a–z] range the function returns an error to the caller. Eventually this error is propagated to drivers/accessibility/speakup/main.c:2217, which causes a bleep sound.

Announced Source revision 1
Original source ↗

CVE-2026-93053

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-93053

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42",
        "lessThan": "fd339b9ef0accb2c24a5285df842552ebf5eb146",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42",
        "lessThan": "900cd6e5ef46bd15153762fb26bb03f874fccc52",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42",
        "lessThan": "6b39969c724d39b6062efa354dc2d38442bfd021",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42",
        "lessThan": "2e91ab73f9beb659f581e2a6a09f79ace1140905",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42",
        "lessThan": "d7deb90c4cd086cb111f0ecc9da021218fbde1b0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42",
        "lessThan": "5310334762c3f08f51dc2414344dd47492c07d1d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42",
        "lessThan": "ca4489b3e54666a7cac7294e71a3cf64e5e95286",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "c6e3fd22cd538365bfeb82997d5b89562e077d42",
        "lessThan": "6a19ad4d68c95185308cd9e5d169b10a2cf236c8",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/accessibility/speakup/keyhelp.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.37"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.37",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/accessibility/speakup/keyhelp.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-93053

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#37791 · Revision 1
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Publisher date
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